(1 ) (2 ) Table 1. Details of each bar group sheared simultaneously (major shearing unit). 208

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2463 UDC 621.771.251.09 : 621.791.94: 669.012.5 Improvement in Cold Shear Yield of Bar Mill by Computer Control System Koji INAZAKI, Takashi WASEDA, Michiaki TAKAHASHI, and Toshihiro OKA Synopsis: The rate of crop loss in bar production is greater than those of other products. The reason is that bars devided in rolling line are sheared again simultaneously to specific lengths. Furthermore, this loss depends on the quality demanded and facilities of shearing as well as billet weight and bar size. Therefore improvement of equipment such as shear mechanism or measuring instrument is as important as sophistication of software to increase the yield. As a result of computer simulation for Nippon Steel's new bar mill,in 1973, Dynamic was found effective for minimizing crop loss and improving productivity. These results were used for modification of equipment plan under construction. In actual bar mill erected in 1974, the highly functional shearing machine and basic "Shearing schedule" were installed as a part of the total computer control system. After integral improvement of software and instruments in two stages, the yield has reached above 97.6%. Additional approaches would become necessary in the next step such as systematization including decision of optimum billet length and introduction of Dynamic Programming to online system. 207

(1 ) (2 ) Table 1. Details of each bar group sheared simultaneously (major shearing unit). 208

2465 Table 2. Series of optimum solutions of Dynamic Programming (main part). Table 3. Optimum number of shearing in each magor shearing unit. 209

2466 Table 4. Comparison of three methods using D. P. Fig. 1. Apparatus of cold shear. 210

2467 Fig. 3. Basic concept of shearing schedule. Fig. 2. Software flow diagram of shearing schedule. 211

2468 Table 5. Step up history of shearing schedule in Muroran bar mill. 212

2469 Fig. 4. Schedule including two main lengths: 6.0, 5.5m. Fig. 5. Rate of total yield and over roll. 1 ) N. KAMII, K. KOKAI, K. INAZAKI, F. SATO, and K. OGATA: Iron Steel Eng., 53 Dec. (1976), P. 47 213